Abstract
'Newhall' navel oranges on 'Carrizo' rootstock were planted in Mar. 1997 at the Citrus Agricultural Center. The objectives of this experiment were to i) determine the effects of N rate and fertigation frequency for microsprinkler-irrigated navel oranges on tree N status, and crop yield and quality; and ii) develop Best Management Practices which promote optimum tree growth and production while minimizing nitrate leaching. The trees are equipped with a microsprinkler irrigation system. The experiment is a randomized complete block factorial with N rates of 0, 0.15, 0.30, and 0.45 lb N/tree/year, and fertigation frequencies of weekly, monthly, and three times per year. Unfertilized control trees are also included in the experimental design. Each of the ten treatments is replicated five times. The trees were harvested in Jan. 2002. Fruit were processed through an automatic fruit sizer, and fruit from each plot were further evaluated for fruit quality. Leaf N concentration was responsive to N rate, but not to fertigation frequency. Leaf N in all fertilized plots was above tissue critical levels. Fruit yield in fertilized plots was higher than in unfertilized plots, but, in fertilized treatments, there was no significant effect of N rate or fertigation frequency on fruit yield or quality.
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Claims 8
Claim · model-written summary
Leaf nitrogen concentration responded to nitrogen rate.
Not reportedDirection
Verbatim
e0“Leaf N concentration was responsive to N rate, but not to fertigation frequency.”
e1“'Newhall' navel oranges on 'Carrizo' rootstock”
Claim · model-written summary
Leaf nitrogen concentration did not respond to fertigation frequency.
- Taxon
- 'Newhall' navel orangese1
- Treatment
- fertigation frequencye0
- Outcome
- Leaf N concentratione0
- Direction
- not toe0
Not reportedComparator
Verbatim
e0“Leaf N concentration was responsive to N rate, but not to fertigation frequency.”
e1“'Newhall' navel oranges on 'Carrizo' rootstock”
Claim · model-written summary
Leaf nitrogen in all fertilized plots exceeded tissue critical levels.
Verbatim
e0“Leaf N in all fertilized plots was above tissue critical levels.”
e1“'Newhall' navel oranges on 'Carrizo' rootstock”
Claim · model-written summary
Fertilized orange plots had higher fruit yield than unfertilized plots.
Verbatim
e0“Fruit yield in fertilized plots was higher than in unfertilized plots”
e1“'Newhall' navel oranges on 'Carrizo' rootstock”
Claim · model-written summary
Among fertilized treatments, nitrogen rate had no significant effect on fruit yield.
Verbatim
e0“in fertilized treatments, there was no significant effect of N rate or fertigation frequency on fruit yield or quality.”
e1“'Newhall' navel oranges on 'Carrizo' rootstock”
Claim · model-written summary
Among fertilized treatments, nitrogen rate had no significant effect on fruit quality.
Verbatim
e0“in fertilized treatments, there was no significant effect of N rate or fertigation frequency on fruit yield or quality.”
e1“'Newhall' navel oranges on 'Carrizo' rootstock”
Claim · model-written summary
Among fertilized treatments, fertigation frequency had no significant effect on fruit yield.
Verbatim
e0“in fertilized treatments, there was no significant effect of N rate or fertigation frequency on fruit yield or quality.”
e1“'Newhall' navel oranges on 'Carrizo' rootstock”
Claim · model-written summary
Among fertilized treatments, fertigation frequency had no significant effect on fruit quality.
Verbatim
e0“in fertilized treatments, there was no significant effect of N rate or fertigation frequency on fruit yield or quality.”
e1“'Newhall' navel oranges on 'Carrizo' rootstock”
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